CN114251186B - All-steel piston machining method and all-steel piston machined by method - Google Patents
All-steel piston machining method and all-steel piston machined by method Download PDFInfo
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- CN114251186B CN114251186B CN202111582350.XA CN202111582350A CN114251186B CN 114251186 B CN114251186 B CN 114251186B CN 202111582350 A CN202111582350 A CN 202111582350A CN 114251186 B CN114251186 B CN 114251186B
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- welding
- oil groove
- piston
- groove
- outer oil
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 32
- 239000010959 steel Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title abstract description 18
- 238000003754 machining Methods 0.000 title description 5
- 238000003466 welding Methods 0.000 claims abstract description 113
- 230000007704 transition Effects 0.000 claims description 3
- 239000011324 bead Substances 0.000 abstract description 9
- 230000003749 cleanliness Effects 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 7
- 230000006978 adaptation Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009957 hemming Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/0015—Multi-part pistons
- F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/0084—Pistons the pistons being constructed from specific materials
- F02F3/0092—Pistons the pistons being constructed from specific materials the material being steel-plate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses an all-steel piston, which comprises: the welding device comprises a piston head and a piston skirt, wherein a welding hole with a preset aperture is formed in the center of the piston head, a welding column for inserting the welding hole is arranged in the center of the piston skirt, a welding table is arranged on the periphery of the welding column, and the lower end face of the welding hole is placed on the welding table; the piston head sets up first outer oil groove and sets up the first interior oil groove between welding hole and first outer oil groove, and the piston skirt sets up the second outer oil groove that corresponds with first outer oil groove, the second that corresponds with first interior oil groove in the oil groove, sets up the retainer between the outside lower terminal surface of first outer oil groove and the outside up end of second outer oil groove, welds hole and welding post, the outside lower terminal surface of first outer oil groove and the outside up end of second outer oil groove. The welding table is arranged on the periphery of the welding column, and the retainer is arranged between the lower end face of the outer side of the first outer oil groove and the upper end face of the outer side of the second outer oil groove, so that the cleanliness of the inner oil cavity and the outer oil cavity is guaranteed, and the molten beads generated in the welding process are prevented from entering the oil cavity.
Description
Technical Field
The invention relates to the technical field of pistons, in particular to an all-steel piston processing method and an all-steel piston processed by the method.
Background
All-steel pistons are the leading edge technology of the current piston technology, and are generally manufactured by adopting modes of integral casting, forging, welding and the like. The design of the cooling oil cavity of the all-steel piston is complex, various processing methods exist, the existing common all-steel piston is forged integrally, the cooling oil cavity is sealed by two semicircular steel sheets, the steel sheets are difficult to manufacture and install, the cost is high, and the risk of falling exists; complex oil chambers are difficult to implement by machining. Because the ceramic core of the cast type sealed cooling oil cavity is insoluble, the ceramic core is difficult to take out in the sealed oil cavity, a process core outlet hole is required to be arranged, and then the process hole is sealed, so that the process is complex. Welding type sealed cooling oil cavity: the oil cavity cooling function is weakened by the welding hemming, the material performance of a welding seam heat affected zone is poor, and welding slag is difficult to clean.
In summary, how to solve the problems of difficult manufacturing and installation of the steel sheet of the forged piston, high cost, falling risk, complex process of casting the piston, poor cooling effect of the oil cavity of the welded piston and difficult cleaning of welding slag is a problem to be solved by the present technicians in the field.
Disclosure of Invention
Therefore, the invention aims to provide an all-steel piston which does not need a steel sheet seal, has good cooling effect and prevents molten beads generated in the welding process from entering an oil cavity.
It is a further object of the present invention to provide a method comprising the above.
In order to achieve the above object, the present invention provides the following technical solutions:
an all-steel piston comprising: the welding device comprises a piston head and a piston skirt, wherein a welding hole with a preset aperture is formed in the center of the piston head, a welding column for being inserted into the welding hole is arranged in the center of the piston skirt, a welding table is arranged on the periphery of the welding column, and the lower end face of the welding hole is placed on the welding table; the piston head set up first outer oil groove and set up in weld the hole with first interior oil groove between the first outer oil groove, the piston skirt set up with the second outer oil groove that corresponds of first outer oil groove, with the second interior oil groove that corresponds of first interior oil groove, the outside lower terminal surface of first outer oil groove with set up the retainer between the outside up end of second outer oil groove, weld the hole with weld the post welding, the outside lower terminal surface of first outer oil groove with the outside up end of second outer oil groove.
Preferably, the welding hole is in transition fit with the welding post.
Preferably, at least two oil through grooves are provided on an upper surface of the piston skirt between the second inner oil groove and the second outer oil groove.
Preferably, at least two oil return holes are formed in the upper surface of the piston skirt portion inside the oil through groove.
Preferably, all the oil grooves are symmetrically arranged about the welding post, and all the oil return holes are symmetrically arranged about the welding post.
Preferably, the outer diameter of the welding post is equal to the diameter of the welding hole and is equal to (8-10)% of the outer diameter of the piston skirt.
Preferably, a first retainer groove is provided on an outer lower end surface of the first outer oil groove, a second retainer groove corresponding to the first retainer groove is provided on an outer upper end surface of the second outer oil groove, and the retainer is provided between the first retainer groove and the second retainer groove.
Preferably, high-energy beam welding seams are arranged between the welding column and the welding hole, and between the outer lower end surface of the first outer oil groove and the outer upper end surface of the second outer oil groove.
The all-steel piston provided by the application is characterized in that the piston is divided into the piston head part and the piston skirt part, the center of the piston head part is provided with the welding hole, the center of the piston skirt part is provided with the welding column, and the welding line is arranged at the center part of the piston, so that the risks of failure of the throat opening and the top surface of the combustion chamber can be reduced; the inner and outer oil cavities formed by the piston head and the piston skirt can improve the cooling effect of the piston, reduce the temperature of the top surface of the piston and prolong the service life of the piston. The welding table is arranged on the periphery of the welding column, and the retainer is arranged between the lower end face of the outer side of the first outer oil groove and the upper end face of the outer side of the second outer oil groove, so that the cleanliness of the inner oil cavity and the outer oil cavity is ensured, and molten beads generated in the welding process are prevented from entering the oil cavity; in addition, the processing difficulty can be greatly reduced, various complex oil duct structures can be simply formed, and the steel body is simpler to form.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a cross-sectional view of an all-steel piston provided by the present invention;
FIG. 2 is a front view of a retainer according to the present invention;
FIG. 3 is a cross-sectional view of a piston head provided by the present invention;
FIG. 4 is a cross-sectional view of a piston skirt provided by the present invention;
FIG. 5 is a top view of a piston skirt provided by the present invention;
FIG. 6 is a cross-sectional view of a piston head blank provided by the present invention;
fig. 7 is a cross-sectional view of a piston skirt blank provided by the present invention.
In fig. 1-7:
1-piston skirt, 2-piston head, 3-oil through groove, 4-oil return hole, 5-welding column, 6-high energy beam welding line, 7-first outer oil groove, 8-guard ring, 9-second outer oil groove, 10-first guard ring groove, 11-welding hole, 12-welding table, 13-second guard ring groove, 14-piston head blank and 15-piston skirt blank.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The core of the invention is to provide an all-steel piston which does not need steel sheet sealing, has good cooling effect and prevents molten beads generated in the welding process from entering an oil cavity.
Referring to fig. 1 to 7, an all steel piston includes: the piston comprises a piston head 2 and a piston skirt 1, wherein a welding hole 11 with a preset aperture is formed in the center of the piston head 2, a welding column 5 for inserting the welding hole 11 is formed in the center of the piston skirt 1, a welding table 12 is arranged on the periphery of the welding column 5, and the lower end face of the welding hole 11 is placed on the welding table 12; the piston head 2 is provided with a first outer oil groove 7 and a first inner oil groove arranged between the welding hole 11 and the first outer oil groove 7, the piston skirt 1 is provided with a second outer oil groove 9 corresponding to the first outer oil groove 7 and a second inner oil groove corresponding to the first inner oil groove, a retainer 8 is arranged between the outer lower end surface of the first outer oil groove 7 and the outer upper end surface of the second outer oil groove 9, the welding hole 11 is welded with the welding post 5, and the outer lower end surface of the first outer oil groove 7 and the outer upper end surface of the second outer oil groove 9 are welded.
According to the structure of the piston head 2, a piston head blank 14 is forged, according to the structure of the piston skirt 1, a piston skirt blank 15 is cast, and the piston is divided into two parts of the piston head 2 and the piston skirt 1 for processing.
Machining a welding hole 11 with the diameter phi H in the center of the piston head 2, and machining and forming a first outer oil groove 7 and a first inner oil groove; a welding post 5 with the diameter phi h is processed at the center of the piston skirt 1, a welding table 12 is processed at the periphery of the welding post 5, the table surface of the welding table 12 faces upwards and is used for receiving the lower end surface of the welding hole 11, and the second outer oil groove 9 and the second inner oil groove are processed and formed.
After the piston head 2 is preheated to 200 ℃, and the retainer 8 is placed on the piston skirt 1, the preheated piston head 2 is pressed and installed, and then the welding post 5 and the welding hole 11 are connected, so that the molten beads generated in the welding process are prevented from flowing out and forming the welding beads which are difficult to clean due to the action of the welding table 12. The lower end of the piston head 2 and the upper end of the piston skirt 1 are welded together, and the molten beads are prevented from flowing out and forming hard-to-clean welding beads in the welding process due to the action of the retainer 8. The welding seam between the welding post 5 and the welding hole 11, the welding seam of the lower end of the piston head 2 and the upper end of the piston skirt 1 form the piston head 2 and the piston skirt 1 into a whole all-steel piston with an inner oil cavity and an outer oil cavity.
The all-steel piston provided by the application is characterized in that the piston is divided into the piston head 2 and the piston skirt 1, the center of the piston head 2 is provided with the welding hole 11, the center of the piston skirt 1 is provided with the welding column 5, and the welding line is arranged at the center of the piston, so that the risks of failure of the throat and the top surface of the combustion chamber can be reduced; the inner and outer oil cavities formed by the piston head 2 and the piston skirt 1 can improve the cooling effect of the piston, reduce the temperature of the top surface of the piston and prolong the service life of the piston. A welding table 12 is arranged on the periphery of the welding column 5, and a retainer 8 is arranged between the lower end face of the outer side of the first outer oil groove 7 and the upper end face of the outer side of the second outer oil groove 9, so that the cleanliness of the inner oil cavity and the outer oil cavity is ensured, and molten beads generated in the welding process are prevented from entering the oil cavity; in addition, the processing difficulty can be greatly reduced, various complex oil duct structures can be simply formed, and the steel body is simpler to form.
On the basis of the above embodiment, as a further preferred mode, the welding hole 11 is in transition fit with the welding post 5, so as to improve the stability of the installation of the welding post 5 and the welding hole 11, thereby improving the welding quality.
On the basis of the above embodiment, as a further preferable mode, at least two oil through grooves 3 are arranged on the upper surface of the piston skirt portion 1 between the second inner oil groove and the second outer oil groove 9, and the oil through grooves 3 can communicate the inner oil cavity with the outer oil cavity, so that the problem of oil duct sealing is solved.
On the basis of the above embodiment, as a further preferred aspect, at least two oil return holes 4 are provided on the upper surface of the piston skirt 1 inside the oil passage groove 3, the two oil return holes 4 are both communicated with the inner oil chamber, and the cooling oil enters the inner oil chamber along one oil return hole 4 and is discharged from the other oil return hole 4, so that the flow-through property of the cooling oil is ensured.
On the basis of the above embodiment, as a further preferred option, all the oil grooves 3 are symmetrically arranged about the welding post 5, and all the oil return holes 4 are symmetrically arranged about the welding post 5, so as to ensure uniform oil inlet and outlet of the outer oil cavity and the inner oil cavity, and promote the cooling effect of the inner oil cavity and the outer oil cavity.
In order to secure the strength of the welding post 5, it is preferable that the outer diameter of the welding post 5 is equal to the diameter of the welding hole 11 by (8-10)% of the outer diameter of the piston skirt 1. Of course, the outer diameter of the welding post 5, the diameter of the welding hole 11 and the outer diameter of the piston skirt 1 may be set to other ratios according to practical situations.
In view of the manner of mounting the retainer 8, it is preferable that the first retainer groove 10 is provided on the outer lower end surface of the first outer oil groove 7, the second retainer groove 13 corresponding to the first retainer groove 10 is provided on the outer upper end surface of the second outer oil groove 9, and the retainer 8 is provided between the first retainer groove 10 and the second retainer groove 13. The first retainer groove 10 and the second retainer groove 13 are disposed opposite to each other, and when the piston head 2 and the piston skirt 1 are assembled, the first retainer groove 10 and the second retainer groove 13 constitute a cavity for accommodating the retainer 8, and the space between the outer lower end surface of the first outer oil groove 7 and the outer upper end surface of the second outer oil groove 9 is reduced.
Further preferably, on the basis of the above embodiment, the high-energy beam weld 6 is formed between the welding post 5 and the welding hole 11, and between the outer lower end surface of the first outer oil groove 7 and the outer upper end surface of the second outer oil groove 9. And the preheated piston head 2 is pressed and installed, and then the welding column 5 and the welding hole 11 are connected by using high-energy beams to form a high-energy beam welding seam 6, so that the welding effect is improved, and the overall performance of the piston is improved.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The invention provides an all-steel piston which is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (6)
1. An all-steel piston, comprising: the piston comprises a piston head (2) and a piston skirt (1), wherein a welding hole (11) with a preset aperture is formed in the center of the piston head (2), a welding column (5) for being inserted into the welding hole (11) is arranged in the center of the piston skirt (1), a welding table (12) is arranged on the periphery of the welding column (5), and the lower end face of the welding hole (11) is placed on the welding table (12); the piston head (2) is provided with a first outer oil groove (7) and a first inner oil groove arranged between the welding hole (11) and the first outer oil groove (7), the piston skirt (1) is provided with a second outer oil groove (9) corresponding to the first outer oil groove (7) and a second inner oil groove corresponding to the first inner oil groove, a retainer (8) is arranged between the outer lower end surface of the first outer oil groove (7) and the outer upper end surface of the second outer oil groove (9), the welding hole (11) is welded with the welding post (5), and the outer lower end surface of the first outer oil groove (7) is welded with the outer upper end surface of the second outer oil groove (9);
at least two oil through grooves (3) are formed in the upper surface of the piston skirt (1) between the second inner oil groove and the second outer oil groove (9);
at least two oil return holes (4) are formed in the upper surface of the piston skirt (1) on the inner side of the oil through groove (3).
2. An all steel piston according to claim 1, characterized in that the weld hole (11) is in transition fit with the weld stud (5).
3. An all steel piston according to claim 2, characterized in that all the oil grooves (3) are symmetrically arranged about the weld stud (5) and all the oil return holes (4) are symmetrically arranged about the weld stud (5).
4. An all steel piston according to claim 1, characterized in that the outer diameter of the welding stud (5) is equal to the diameter of the welding hole (11) and equal to (8-10)% of the outer diameter of the piston skirt (1).
5. The all-steel piston according to claim 1, wherein a first retainer groove (10) is provided on an outer lower end surface of the first outer oil groove (7), a second retainer groove (13) corresponding to the first retainer groove (10) is provided on an outer upper end surface of the second outer oil groove (9), and the retainer (8) is provided between the first retainer groove (10) and the second retainer groove (13).
6. An all-steel piston according to any one of claims 1 to 5, characterized in that high-energy beam welds (6) are provided between the welding stud (5) and the welding hole (11), between the outer lower end face of the first outer oil groove (7) and the outer upper end face of the second outer oil groove (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111582350.XA CN114251186B (en) | 2021-12-22 | 2021-12-22 | All-steel piston machining method and all-steel piston machined by method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111582350.XA CN114251186B (en) | 2021-12-22 | 2021-12-22 | All-steel piston machining method and all-steel piston machined by method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114251186A CN114251186A (en) | 2022-03-29 |
| CN114251186B true CN114251186B (en) | 2024-02-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111582350.XA Active CN114251186B (en) | 2021-12-22 | 2021-12-22 | All-steel piston machining method and all-steel piston machined by method |
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| Country | Link |
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| CN (1) | CN114251186B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102639850A (en) * | 2009-12-23 | 2012-08-15 | 费德罗-莫格尔公司 | Reinforced dual gallery piston and method of construction |
| CN102943717A (en) * | 2012-12-06 | 2013-02-27 | 湖南江滨机器（集团）有限责任公司 | Steel roof aluminum skirt combinational piston |
| CN204783311U (en) * | 2015-05-15 | 2015-11-18 | 山东滨州渤海活塞股份有限公司 | Diesel engine piston is connected to single double -screw bolt |
| WO2017082136A1 (en) * | 2015-11-09 | 2017-05-18 | いすゞ自動車株式会社 | Steel piston, steel piston cooling method, and steel piston production method |
| CN211819700U (en) * | 2020-03-31 | 2020-10-30 | 广西玉柴机器股份有限公司 | Steel top piston for large-cylinder-diameter gas engine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8146560B2 (en) * | 2008-11-05 | 2012-04-03 | Mahle International Gmbh | Multi-part piston for an internal combustion engine and method for its production |
| DE102009032941A1 (en) * | 2009-07-14 | 2011-01-20 | Mahle International Gmbh | Multi-part piston for an internal combustion engine and method for its production |
| US10704491B2 (en) * | 2018-10-11 | 2020-07-07 | Tenneco Inc. | Piston cooling gallery shaping to reduce piston temperature |
-
2021
- 2021-12-22 CN CN202111582350.XA patent/CN114251186B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102639850A (en) * | 2009-12-23 | 2012-08-15 | 费德罗-莫格尔公司 | Reinforced dual gallery piston and method of construction |
| CN102943717A (en) * | 2012-12-06 | 2013-02-27 | 湖南江滨机器（集团）有限责任公司 | Steel roof aluminum skirt combinational piston |
| CN204783311U (en) * | 2015-05-15 | 2015-11-18 | 山东滨州渤海活塞股份有限公司 | Diesel engine piston is connected to single double -screw bolt |
| WO2017082136A1 (en) * | 2015-11-09 | 2017-05-18 | いすゞ自動車株式会社 | Steel piston, steel piston cooling method, and steel piston production method |
| CN211819700U (en) * | 2020-03-31 | 2020-10-30 | 广西玉柴机器股份有限公司 | Steel top piston for large-cylinder-diameter gas engine |
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| Publication number | Publication date |
|---|---|
| CN114251186A (en) | 2022-03-29 |
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